Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4de722a9f86e
Author: Aleh Zasypkin <aleh.zasypkin@gmail.com>
Desc: Merge pull request #22127 from dholbert/1043518

Bug 1043518 - Typing a long message or contact-name in SMS app will push the "send" / "add contact" buttons offscreen

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https://hg.mozilla.org/integration/gaia-central/rev/cceffcde00f9
Author: Daniel Holbert <dholbert@cs.stanford.edu>
Desc: Bug 1043518: Add explicit "min-width:0" to flex items in SMS app, for recipient, compose, & message-body fields, so long user input doesn't blow up those elements. r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/59a55705320d
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #22054 from johngruen/bug-1013522-firefox-account-ui-should-match

Bug 1013522 - Firefox Accounts system app visual polish part two r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/bdb473afea98
Author: johngruen <john.gruen@gmail.com>
Desc: Bug 1013522 - Firefox Accounts system app visual polish. r=ferjm

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https://hg.mozilla.org/integration/gaia-central/rev/d7f4777bac89
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #22166 from stasm/1041870-branding-regression

Bug 1041870 - Fall back to official en-US branding. r=gandalf

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https://hg.mozilla.org/integration/gaia-central/rev/dbe348d7c897
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1041870 - Fall back to official en-US branding. r=gandalf
Bumping manifests a=b2g-bump